Apparatus for grinding and polishing lenses.



C. W. CONNEH.

v APPARATUS roa GRINDING AND POLISHING LENSES.

V APPLICATION FILED DEC. I1. 1911, 1,162,039, I Patented Nov. 30, 1915.

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APPLICATION FILED DEC. II. I91 I.

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APPARATUS FOR GR|NDING AND POLISHING LENSES.

APPLICATION FILED DEC. 11. I911.

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D 1 ATES PATENT OFFICE.

CHARLES W. OONNERQOF INDIANAPOLIS, INDIANA, ASSIG NOR 'IO ONE-PIECE BIFOCAL LENS COMPANY, OF INDIANAPOLIS, INDIANA, A CORPORATION.

' APPARATUS FOR GRINDING AND POLISHING LENSES.

Specification of Hitters Patent.

Patented Nov. 30, 1915.

Application filed December 11,1911. Serial No. 665,066.

To all whom it may concern:

Be it known that I, CHARLES W. CONNER, of Indianapolis, county of Marion, and State of Indiana, have invented a certain useful Apparatus for Grinding and Polishing Lenses; and I do hereby declare that'the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings.

The object of this invention is to improve the construction and operation of apparatus for grinding, polishing or finishing bifocal lenses so as to insure absolute accuracy in the operation, and to enable the tool to grind either of the twosurfaces on the same side of the lens or lens blank.

Onefeature of the invention consists in means for mounting a button holding pin in two different positions, oneposition for treating the reading surface of the lens and the other for treating the distance surface of the lens. It is understood that thelens thus treated is concave, a central circular surface constituting the reading surface and a surrounding annular surface constituting the distance surface. For treating-the central or reading surface the pin is held in a vertical position preferably and for treating the surrounding distance surface the .pin is held in an oblique position substantially perpendicular to said surface. Therefore, this feature of the invention consistslin means for holding the button holding 'pin' in positions perpendicular substantially to the various surfaces of the lens to be treated.

Another feature of-the invention consists in providing an arm' on the free end of which said pin is mounted, and. the other end is widened and pivotally mounted by springpushed and adjustable pivots located at the opposite sides thereof so as to prevent OSCII'? lato'ry.v or lateral movement .of the pin, but

permit the free end of said arm and the pin to be moved upward away from the work.

The nature'of the invention will be understood from the accompanying drawings and the following description and claims- I y In the drawings,-Figure lis a side 'eleva- I tion of the machine, the pinba'rryi'ng arm being shown in an elevated idle position by.

dotted lines. Fig. 2 is a'plan view of the machine, part of the table being broken away. Fig. 3 is a section on'the line 3-3 of Fig; 2. Fig. 4 is a vertical section through the upper part of the apparatus on the line 4. 4. of Fig. 2. Fig. 5 is a plan view of the end of the arm carrying a pin when the pin isin a vertical position. Fig. 6

1s a front elevation. of the same showing the oblique position in full lines and the vertical position in dotted lines. Fig. 7 is a. plan v1ew of the lens blank which is ground or polished by this machine.

A stand 10 carries a table 11, to the underside of which a motor 12 is secured from which a belt 13 runs over pulley 14 on the vertical driving shaft 15, mounted at its lower end in the bracket arm 16 which extends down from the bOiltOIl'kOf the-table, and at its upper endmounted in suitable bearings 17 extending through the table 11 and the plate 18, which is on top of the table and secured thereto by the screws 19 and 20. The upper end of the shaft 15 is tapering to receive the flaring shank 22 of the lens holder 23, which holds the lens. blank 24, while t is belng treated. The tapering conmotions of the partsv 15 and 22 extend through the center of the lens holder. A

pair of posts 25 and 26 extend upward from the plate 18. The post 25, see Fig. 3, carries the pointed screw 27 while the other post 26 carries a hollow screw 28 in which a spring 29 lies and said spring projects into a hollow pointed pivot member 30. On said pointed'pivot holder and the pivot screw 27 a triangular pin holding arm 31 is mounted, as shown in Fig. 3, so that said arm can be oscillated from the horizontal or vertical positi'on. =The outer ends of the rear portion of the arm 31 have central holes 32 to receive the points. The forward end of the arm 31 carries a head or plate 33, which has ,a vertical face when the arm is in a horiz'ontalposition, as shown in 4. To one .side of the head the pin- .hol'der 34 is securedby the clamping screw35. The pin holder 3 f has a central opening through it at.36 for the insertion of the pin '37, and the otherend'of the holder 3tis split forming two cars 38, which are clamped together bythe bolt 39. In this manner the pin 37 is'clamped in theholder and the holder is adjustable on the head 33 so that the pin can be given at least two positions, as shown in Fig. 6. Thepin holder 34 is moved to either of these two positions and then clamped. The pin is double-pointed so that the lower point enters the concave upper surface of a grinding or polishing button 40, see Fig. 4,

and holds it in place accurately during the revolution of thelens blank 24:, and in, that way the surface is ground or polished. Bi-

focal lenses are, with this mechanism, made by finishing one side 'of a blank, which is circular and concave, as shown in Fig. 4,

and'on this concave side two surfaces are formed; a'central, circular surface, which is ground and polished by the button 40 with the pin 37 in its vertical position, as shown by dotted lines in F ig. 6; and said central surface of the lensbl'ank is surrounded by a spherical surface and that is ground and polished by the button when the pin 37 is in the inclined positionyas shown in Fig. 6.

When the button is as shown in Fig. 4, it is grinding or polishing the outer of the two bifocal lenses including rotatable means for holding the lens, a button adapted to be placed upon the lens for grinding and .polishing the same, a pin for holding said button in proper position on the lens, an arm pivoted so that the free end thereof will be vertically oscillatory over the lens holder, and means on the free end of the arm for mounting said button holding pin so that said pin may beadjustable in a plane at right angles to the lens holder and when adjusted said pin can have only vertical movement. i

' 2. Apparatus forgrinding and polishing lenses including rotatable means for holding the lens, a vertically oscillatory arm with a flat-faced head and movable to position over said lens'holder, a button for grinding or polishing the lens, a buttons-holding pin, a pin-holding clamp through which said pin extends, and means for pivotally mounting and adjustably clamping said clamp to said flat face-of the arm, whereby the pin may be held in either a vertical or oblique position.

In witness whereof, I have hereunto aifixed my signature in the presence of the witnesses herein named.

CHARLES W. CONN ER. Witnesses I 1 G. H. BorNK, O. M. MGLAUGHLIN. 

